The assets package contains a hallway model. Created in the free 3D software package Blender, it's essentially a square donut with the normals flipped so that it appears inside out.
We're going to set up one camera to bounce up and down, as if the character is running, and send it flying through the hallway. Then we'll set that view as the background for our Main Camera, which is aimed at the heart-and-tray action. By using Depth as our Clear Flags setting on the foreground camera, the background camera will show through the empty space.